Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdbaabdfba7e54904cf36c7b8a1e0713a99f122d74702113d46f7612e2e3de1' 
  AND token = 'QcSwCmKx0yyQWBJJqxrU/K393d9F2ilcRTSYcmQIRdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}